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Consistency checks in the ΛCDM: transparency, BAO scale and Λ-domination

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Title: Consistency checks in the ΛCDM: transparency, BAO scale and Λ-domination
Authors: Avgoustidis, Anastasios1 tasos@ieec.uab.es
Source: Nuclear Physics B Proceedings Supplement. Oct2009, Vol. 194 Issue 1, p173-177. 5p.
Subjects: Dark matter, Baryons, Big bang theory, Type I supernovae, Expanding universe, Sound waves, Constraints (Physics), Redshift
Abstract: Within the ΛCDM model, we perform consistency checks among different distance measures, combining Supernovae Type Ia (SNIa) data, direct measurements of Hubble expansion H(z), and the Baryon acoustic oscillation (BAO) scale. We present new constraints on cosmic transparency using both H(z) and the latest SNIa (Union) data. For a flat model, this improves current constraints by nearly an order of magnitude. We also revisit the recently reported tension between the BAO scale and SNIa data in light of possible deviations from transparency, and conclude that the source of the discrepancy may most likely be found in systematic effects in modelling of the low redshift data, or simply in a ∼ 2-σ statistical fluke, rather than in exotic physics. Finally, combining H(z) and SNIa data, we attempt to draw model-independent conclusions about the recent accelerated expansion, and determine the acceleration redshift to (1-σ). [Copyright &y& Elsevier]
Copyright of Nuclear Physics B Proceedings Supplement is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: <searchLink fieldCode="DE" term="%22Dark+matter%22">Dark matter</searchLink><br /><searchLink fieldCode="DE" term="%22Baryons%22">Baryons</searchLink><br /><searchLink fieldCode="DE" term="%22Big+bang+theory%22">Big bang theory</searchLink><br /><searchLink fieldCode="DE" term="%22Type+I+supernovae%22">Type I supernovae</searchLink><br /><searchLink fieldCode="DE" term="%22Expanding+universe%22">Expanding universe</searchLink><br /><searchLink fieldCode="DE" term="%22Sound+waves%22">Sound waves</searchLink><br /><searchLink fieldCode="DE" term="%22Constraints+%28Physics%29%22">Constraints (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Redshift%22">Redshift</searchLink>
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  Data: Within the ΛCDM model, we perform consistency checks among different distance measures, combining Supernovae Type Ia (SNIa) data, direct measurements of Hubble expansion H(z), and the Baryon acoustic oscillation (BAO) scale. We present new constraints on cosmic transparency using both H(z) and the latest SNIa (Union) data. For a flat model, this improves current constraints by nearly an order of magnitude. We also revisit the recently reported tension between the BAO scale and SNIa data in light of possible deviations from transparency, and conclude that the source of the discrepancy may most likely be found in systematic effects in modelling of the low redshift data, or simply in a ∼ 2-σ statistical fluke, rather than in exotic physics. Finally, combining H(z) and SNIa data, we attempt to draw model-independent conclusions about the recent accelerated expansion, and determine the acceleration redshift to (1-σ). [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Nuclear Physics B Proceedings Supplement is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.nuclphysbps.2009.07.082
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        Text: English
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      – SubjectFull: Dark matter
        Type: general
      – SubjectFull: Baryons
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      – SubjectFull: Big bang theory
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      – SubjectFull: Type I supernovae
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      – SubjectFull: Sound waves
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      – SubjectFull: Constraints (Physics)
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      – SubjectFull: Redshift
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              Text: Oct2009
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